Thanks for all the info everyone puts on here regarding tires. It was nice to have a source. I thought I should add my recent experience with two different sets for others needing info. Went to NTB and got Cooper Zeon LTZ's they rode a lot rougher than stock Wrangler HP's but otherwise seemed fine may have hurt MPG but not as sure as on the second set. I had a vibration they couldn't get rid of so they refunded money, kudos. Went to a great local place and bought BFG All Terrain KO's in 275/65 20 and they DO rub when at full lock i had read on here this size was fine. The KO's KILLED mpg. I make a 380 mile round trip drive hunting every weekend and average at least 18.6 mpg and if I take it easy I can get 19.1. This weekend I got 14.1. Also, still vibrating so I figure it's the driveshaft or u-joint if anyone knows anything about that, only at high speeds, 71+
If anybody has good gas mpg experience with an all terrain tire on same truck I would appreciate the info.

 

I have been extremely happy with my Goodyear Wrangler Silent Armor. I would recommend them to anyone.

However, if you want a more aggressive tire, you are most likely going to suck up some MPG loss. AT tires weigh more, and more rotating mass = less MPG.

 

Ditto, ran them on my '03 and they will be next on my '11. Great in snow, good enough off-road, quiet, and mpg was not affected very much. I stuck with the P-series. No need for the E-rated in my case.

 

However, if you want a more aggressive tire, you are most likely going to suck up some MPG loss. AT tires weigh more, and more rotating mass = less MPG.[/QUOTE]

I expected some mpg loss but 4.5 mpg?? I talked to my tire guy and he said in 20 years he hasn't seen that much of a difference with the small size change I made.

 

Mine only dropped maybe 1 mpg with the Silent Armors.

 

I put on the Cooper Zeon LTZ tires after my stock ones faded away. As you mention, they do ride a little rougher. They seem stiffer and/or heavier than the OEM Goodyears. But wow, the traction increase is dramatic. I really like them for this aspect, as well as their good looks. I don't know that they have affected MPG much.

Rob

 

Have you investigated if there is another cause for the drop in MPG? Maybe it's time for a tune up? Or something else is in need of being replaced.

 

It only has 40k miles should it need a tune up? Any suggestions on what might need to be replaced? It's going to the dealer next week for the vibration.

 

Have you checked the plugs yet? Most will be fine at 40K but the book calls out 30K. It may help, slightly.